Fuel valve for internal-combustion engines



April 1'5, 19.24.

C. DAY

FUEL VALVE FOR INTERNAL COMBUSTION ENGINES Filed 'March l0 ,1923

a AF .naasten .ape is, reza srs Utili CHARLES DAY, 0F STOGKPORT, ENGLAND.

FUEL VALVE FOR INTERNAL-COMBUSTION ENGINES.

Application led March l0, 1923. Serial No. 624,291.

ln connection with the valves controlling the admission of fuel oil to the cylinders of oil engines, and particularly of engines yof the Diesel type Where compressed air is used to inject the fuel, it has hitherto been customary to use a gland with fibrous or metallic packing to prevent leakage of compressed air past the valve spindle.

Such a gland if improperly packed, may

cause sticking of the valve, hence 'various devices have previously been used to overcome this diculty.

Also it has hitherto been customary for each such valvezspindlc to be formed in one piece extending from the working valve face to right up to the outer guide and to the operating lever, thus necessitating extreme accuracy in the alignment of the various surfaces guiding the spindle.

This invention has for its objects-(l) the dispensing with the need for packing and the doing so in a simple and inexpensive manner, which can be readily applied to many existing engines with little alterationV-(Q) the removal of the necessity for extreme accuracy of alignment of the whole length of the surfaces guidingY the spindle.

l attain these objects by the means illustrated in the accompanying drawing, in whichv Figure 1 is a detached view in vertical section of a fuel valve Jlior internal combustion engines. -v l Y Figure 2 is a detached view in 'vertical sectionof a portion of a uel valve and illustrates a modification.

Figure 3 is a detached view in vertical section of a fuel valve and illustrates another construction.

lteiierring to Figure l of the drawings in. the construction illustrated therein, the fuel valve is divided into two arts A1 and A2 connected by means of a s eeve coupling B and cotters (l, the cotters and the slots in which the cotters are inserted being so arranged as to allow a little play both in the direction oi the axis of the Jfuel valve, and in regard to the alignment et the two portions, whilst giving a definite means of lifting the lower portion A1 by the upper portion A2.

Instead of a sleeve and' cotters, other. forms of connection may be used, as for inf stance that shown by Figure 2, Where collars are formed on the portions A1 and A2, and a surrounding sleeve B with collars formed inside is fitted in such a Way as to allow of the play previously referred to, whilst giv- 1ng a definite means ot lifting the lower portion A1 by the upper portion A2. 'lo facilitate the attachment of the sleeve B this may be made in halves, the halves being held in place by an outer casing C.

@n the upper portion ot the spindle A2 a valve face E is Jformed in such a position that this valve face rests on a seat formed in the surrounding casing F or attached thereto, whenever the valveis not being lifted by its operating lever. A spring D may if desired be placed between the portions A1 and A2.

lVhether the arrangement illustrated in Figure l or that illustrated in Figure 2 or an alternative lmode of connection be adopted, longitudinal and lateral flexibility is to be provided, so that when the upper valve face E, i. e. the valve face on portion A2 rests on its seat, the valve face G, at the bottom of the lower portion A1 will also rest on its seat without any restraint from the coupling, and so that proper movement of the valve will not be interfered with by slight errors of alignment between the two portions A1 and A2.

When the upper portion A2 is lifted by the f operating lever (not shown), the first movement of this will be to take up the clearance at the cotters C shown in Figure l, or at' the collars shown in Figure 2. lVhen this clearance has been taken up, the lower portion A1 will be lifted. The outside spring which presses on the upper portion A2 will when the lever is not lifting the valve., press the valve tace E against the seat formed on the casing, and thus prevent leakage of air past the spindle A2. i

lln cases where to open the fuel valve it is necessary to move the spindle in the opposite direction, the valve face E on the portion A will be on the underside of the guide formed by the casing as shown in Figure 3 and the portion A2 instead of pulling the portion A1 will now push it to open the fuel valve. The valve tace Fl on the portion A2 when pressed lll@ a meegaat ating lever, (not shown) it presses on the adj ustable cap attached to the lower portion A1 and opens the fuel valve face G to admit of fuel oil being blown into the cylinder. When lthe portion A2 is released by the operating lever theportion A1 is lifted by the spring H, thus closing the valve G and the air pressure forces the valve E against its face and prevents leakage past the spindle A2.

mother the arrangement adopted is that shown in Fig. 1,Fig. 2 or Fig. 3, leakage past the spindle 'can only take place during the period that the valve E is od its seat, which period is very small compared with its closed period.

What I claim is- 1. 7[n an internal combustion engine using compressed air for the injection of fuel, a two part fuel valve the parts whereof are separate but in line with each other; a valve on the outer part of the fuel' valve; a fuel valve casing; and a valve seat on the said casing adapted to cooperate rwith the valve on the said outer part and prevent air leakage from the casing during practically the whole ci' the period the fuel valve rests on its seat.

2., In an Iinternal combustionengine using eompressed air for the injection of fuel, a two part fuel valve the parts whereof. are separate but in line with each. other; a fuel valve casing; means on the fuel valve and the casing for preventing leakage of air from the easing at predetermined periods; and a yieldin coupling connecting the two parts of the el valve together.

3. In an internal combustion engine using compressed air tor the injection of fuel, a two part nelvvalve the parts'whereof are separate; a fuel valve casing; means on the fuel valve and the easing for preventing leakage of air from the casing; and a longitudinally and laterally exible coupling means connecting the two parts of the fuel valve together.

Li; In an internal combustion engine using compressed air 'for the injection of fuel, a fuel valve casing; a 'fuel valve seat at the inner end of the easing;` a valve seat at the outer end of the easing-,1a sliding member in the casing provided with a fuel valve 'face to cooperate with the 'uel valve seat; a sliding member in the casingprovided with a valve tace to cooperate with the valve seat at the outer end of' the casing; resiliently yielding means arranged between the said sliding members to transmit sliding movement from the one sliding member to the other in a resilient manner; movement transmitting means provided onone of the sliding members and transmitting movement to theother sliding member with a predetermined amount of lost movement.

In testimony whereof, l have signed my name to this specification at Stockport, in the oonnty of Chester, England, this 20th day of February, 1923.

CHARLES BAY.

Witz/.lessees desem Brommy, Enn'nsr Wannee. 

